Synthesis of carba analogs of 6-O-(benzyl)-d-allal- and -d-galactal-derived allyl epoxides and evaluation of the regio- and stereoselective behavior in nucleophilic addition reactions
作者:Valeria Di Bussolo、Ileana Frau、Lorenzo Checchia、Lucilla Favero、Mauro Pineschi、Gloria Uccello-Barretta、Federica Balzano、Graziella Roselli、Gabriele Renzi、Paolo Crotti
DOI:10.1016/j.tet.2011.04.036
日期:2011.6
The new racemic diastereoisomeric epoxides 6α and 6β, the carba analogs of the corresponding d-galactal- and d-allal-derived allyl epoxides have been synthesized and their regio- and stereoselective behavior examined in addition reactions with model O-, C-, N-, and S-nucleophiles. The results have indicated that epoxide 6β has a pronounced tendency toward anti-1,2-addition, whereas epoxide 6α shows
合成了新的外消旋非对映异构体环氧化合物6α和6β,它们是相应的d-半乳糖和d -allal衍生的烯丙基环氧化合物的氨基甲酸酯类似物,并与O-,C-,N型反应进行了区域和立体选择-和S-亲核试剂。结果表明,环氧化物6β具有明显的抗-1,2-加成趋势,而环氧化物6α显示出有趣的顺-和/或抗-水平。-1,4-加法过程。环氧6β的手性识别过程证明环氧6α的一致减少。所有结果均已在构象,空间和立体电子效应的基础上进行了合理化。